Wolverine

Wolverine was once just a man named Logan. However, this seemingly simple man was actually a mutant, born with a healing factor and three claws that could protrude from his knuckles at will. Logan was captured by the Weapon X program, which brainwashed him repeatedly and coated his skeleton with the indestructible metal known as adamantium. Logan eventually escaped, with no memory of his past. Since then, he has come to join the Avengers and lead the X-Men.